docs: Add session debrief about test fixes and MCP tool lesson

conductor/archive/test_fixes_session_debrief.md

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+# Session Debrief: Test Fixes
+
+## Summary
+Fixed 329/330 tests passing for asyncio_decoupling_refactor_20260306 track.
+
+## What Worked
+- Fixed import paths in 20+ test files (aggregate → src.aggregate)
+- Fixed mock paths (gemini_cli_adapter.subprocess.Popen)
+- Fixed ApiHookClient methods (post_session, get_events, clear_events, post_project)
+- Fixed callback path in app_controller.py
+
+## What Failed - test_visual_orchestration.py
+- Root cause: orchestrator_pm.generate_tracks() returns tracks but they're not reaching the popup
+- Debug showed: AI IS called (1262 tokens), no parsing errors, but proposed_tracks=[]
+- Issue in the _pending_gui_tasks queue - tracks aren't being processed
+
+## CRITICAL MCP TOOL LESSON
+When using manual-slop_edit_file, parameters are CAMEL CASE:
+- oldString (NOT old_string)
+- newString (NOT new_string)  
+- replaceAll (NOT replace_all)
+
+The tool schema shows camelCase. Never assume snake_case. Always verify params from schema.
+
+## Files Modified
+- src/api_hook_client.py
+- src/app_controller.py  
+- src/orchestrator_pm.py
+- tests/test_*.py (20+ files)
+- tests/mock_gemini_cli.py